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| Rotor position self-sensing in induction motor based on transient excitation |
| 1.School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;2.Beijing Metallurgical Equipment Research and Design Corporation Ltd of MCC Group,Beijing 100029,China;3.School of Information Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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Abstract To track the rotor position of an induction motor at standstill and higher speeds,an approach by superposing twice subtraction of current transient samples was proposed.Voltage test pulse generated by inverter was injected into the phase windings,and the transient current changes were evaluated to obtain the parasitic effects due to rotor position.The mathematic model for an inverter-fed induction motor excited by transient pulses was discussed.According to the non-ideal behavior of dead-time effect and side-effects,which were caused by PWM inverter in sensorless control system,the simulated waves of current transient change due to exciting pulses with and without dead time were compared,and a compensation method was introduced to reduce the dead-time effect.An improved inverter side passive filter was proposed for mitigating dv/dt values of common-mode and differential-mode as well as the distortion of transient current response.The rotor position information for a 3 kW induction motor was derived by the method,and the feasibility of the proposed method was verified through experiments.The results show that the transient current has parasitic effects to reflect rotor position.
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2010, Vol. 31 
